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author | Richard Fitzgerald <rf@opensource.wolfsonmicro.com> | 2016-11-29 18:44:38 +0300 |
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committer | Mark Brown <broonie@kernel.org> | 2016-11-30 20:16:09 +0300 |
commit | 1b4d9c22191583ef1fb7433417b2ceb2a608d887 (patch) | |
tree | 2f3a9d88142e5bc4771062e8b8be072c2e45c6c7 /sound/soc/mxs | |
parent | 1001354ca34179f3db924eb66672442a173147dc (diff) | |
download | linux-1b4d9c22191583ef1fb7433417b2ceb2a608d887.tar.xz |
ASoC: core: Add component pin control functions
It's often the case that a codec driver will need to control its
own pins. However, if a name_prefix has been applied to this codec it
must be included in the name passed to any of the snd_soc_dapm_x_pin()
functions.
The behaviour of the existing pin control functions is reasonable, since
you may want to search for a fully-specified name within the scope of an
entire card. This means that we can't apply the prefix in these functions
because it will break card-scope searches.
Constructing a prefixed string "manually" in codec drivers leads to a lot
of repetition of the same code.
To make this tidier in codec drivers this patch adds a new set of
equivalent functions that take a struct snd_soc_component instead of a
dapm context and automatically add the component's name_prefix to the
given name. This makes it a simple change in codec drivers to be
prefix-safe.
The new functions are not quite trivial enough to be inlines and the
compiler won't be able to compile-away any part of them.
Although it looks somewhat inefficient to have to allocate a temporary
buffer and combine strings, the current design of the widget list
doesn't lend itself to a more optimized implementation - it's a single
list of all widgets on a card and is searched linearly for a matching
string. As pin state changes are generally low-frequency events it's
unlikely to be a significant issue - at least not enough to rewrite the
widget list handling just for this.
Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/mxs')
0 files changed, 0 insertions, 0 deletions